In-situ sulfur dioxide capture by flame-injected sorbents
The author has burned 52 coal-volatiles-like (doped with sulfur dioxide) float flames that simulate well the early stages of coal combustion, as well as provided good times/temperature resolution. The experimental and theoretical research program of SO/sub 2/ capture lead to the following findings. (1) Significant (20-50%) SO/sub 2/ capture occurs rapidly (2.5 milliseconds) in the early zones of coal volatiles-like flames. (2) Increasing residence time did not necessarily increase the SO/sub 2/ capture efficiency. (3) For non-precalcined sorbents, SO/sub 2/ capture was proportional to (Ca/5)/sup x/, x = 0.21-0.43. For the partly-precalcined sorbents, capture was proportional to (Ca/S)/sup y/, y = 0.60-0.77. (4) SO/sub 2/ capture doubled when N/sub 2/ replaced CO/sub 2/ as the inert component of the oxidant. (5) At lower temperatures (1279-1383 K) in CO/sub 2/-containing flames, no significant effect of equivalence ratio on SO/sub 2/ capture was observed for all sorbents. In N/sub 2/-containing flames (1369-1417 K), fuel-lean (0 = 0.8) conditions favored SO/sub 2/ capture over fuel-rich ( 0 = 1.2) conditions for all sorbents. SO/sub 2/ capture for the stoichiometric condition was randomly above, between, or below that for either fuel-lean or fuel-rich conditions. (5) For all equivalence ratios, one sorbent exhibited the most efficient capture of SO/sub 2/ because of its having the highest porosity, the smallest mean-volume diameter, some pre-calcination, and considerably high surface area. (7) SO/sub 2/ capture data from experiments could be predicted quite successfully using a modified pore tree model and by adjusting the global rate coefficient and global reaction exponent of SO/sub 2/ concentration.
- Research Organization:
- Pennsylvania State Univ., University Park (USA)
- OSTI ID:
- 7016134
- Country of Publication:
- United States
- Language:
- English
Similar Records
Testing of wall-fired furnaces to reduce emissions of NO/sub x/ and SO/sub x/. Volume 2. Appendices. Final report, August 1982-November 1983
Testing of wall-fired furnaces to reduce emissions of NO/sub x/ and SO/sub x/: Volume 1. Final report, for August 1982-November 1983
Related Subjects
010800* -- Coal
Lignite
& Peat-- Waste Management
014000 -- Coal
Lignite
& Peat-- Combustion
ADSORBENTS
BENCH-SCALE EXPERIMENTS
CALCINATION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COMBUSTION KINETICS
COMPARATIVE EVALUATIONS
DECOMPOSITION
DESULFURIZATION
EFFICIENCY
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUEL-AIR RATIO
FUELS
KINETICS
MATERIALS
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POROSITY
PYROLYSIS
QUANTITY RATIO
REACTION KINETICS
REMOVAL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE AREA
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE